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Architecture-based Testing: how MBT may help?. Software Architecture (traditional understanding). The Software Architecture is the earliest model of the whole software system created along the software lifecycle

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software architecture traditional understanding
Software Architecture (traditional understanding)

The Software Architecture is the earliest model of the whole software system created along the software lifecycle

SA as a high level design blueprint of the system to be used during the system development and later on for maintenance and reuse

Describes (in a more or less “formal” notation) how a system is structured intocomponents and connectors(SA topology) and how these elements interact(SA dynamics)

software architecture
Software Architecture
  • Let us reason about the Gaudi’s Sagrada Familia
  • Selected components/interfaces/connectors
  • Selected SA Style and constraints
  • Expected behavior
  • HW/SW/Deployment views
  • Components’ Nesting and sub-systems
  • NF attributes
software architecture recent future understanding
Software Architecture (recent/future understanding)
  • A set of architecture design decisions taken to generate the architecture artifact
    • An SA is not only the “output” of the design decision process
      • Design issues, alternative solutions, rationale
  • Focus on set of Views and Viewpoints, looking at stakeholders and their concerns
    • Different stakeholders require different views, to solve different concerns
      • ISO/IEC 42010 (just approved)
design decisions views

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2

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Design Decisions & views
  • Why a certain architectural style has been selected?
  • Why a certain technology has been selected?
  • Why the centralized data solution is more appropriate?
  • Dependencies among decisions
  • Structural, Behavioral, Trust, Financial, Performance, … views
example
Example

Picture taken from: http://www.watblog.com/2010/08/18/tcs-to-build-the-%E2%80%98nano-of-it%E2%80%99-cheap-cloud-computing-india/

sa based testing and regression testing
SA-based Testing and Regression Testing
  • An implementation should conform to the Architectural specification
      • Is my implementation really compliant to my architectural specification… [and my design decisions]
  • SA structure and behavior models used to generate SA-level test specifications
  • Lessons learned:
      • The “distance” between SA and code is challenging
      • The SA model is (by definition) partial and incomplete
      • non-determinism
      • Regression Testing to manage the architectural drift

Previous work: [TSE04] [JSS06]

software architecture based testing in practice
Software Architecture-based testing in practice
  • A project is ongoing with the SEI, on architecture-based testing
    • CMU SEI, University of L’Aquila, CNR-Pisa
  • Goal:
    • To identify industrial needs related to SA-based testing
    • To identify potential solutions to driving examples
    • To identify how the testing/analysis community may help to solve industrial needs and driving examples
tentative driving problem

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Tentative driving problem

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Fly test

[Pictures taken from Google Images]

question
Question
  • How (your experience with) MBT may help to deal with this type of problems?
  • A working group is being formed
      • MBT, regressiong testing, component-based testing, product line testing, formal verification, software architecture, …
  • I will appreciate any feedback you might provide
references
References
  • [TSE04] H. Muccini, A. Bertolino and P. Inverardi, "Using Software Architecture for Code Testing". In IEEE Transactions on Software Engineering, Vol. 30, Number 3, March 2004, pp. 160-171.
  • [JSS06] H. Muccini, M. Dias and D. J. Richardson, "Software Architecture-based Regression Testing“.In the Journal of Systems and Software (JSS), Special Issue on "Architecting Dependable Systems". Vol. 79, Issue 10 , October 2006, Pages 1379-1396.
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